5 replies to this topic

[39.1N84.5W]

If this is the wrong subforum please move.

I have a William Optics 2" durabright diagonal and I'm upgrading to a baader zeiss 2" prism. Can I simply unscrew the WO nose piece and thread that into the Baader? The baader is T/T2 thread but I don't know what the WO thread is.

[slavicek]

Then give it a try!

[The Cloud Gazer]

I have these two diagonals, the WO has an M48 thread and the baader has the SCT thread (50.8mm) so it won't fit. 

Although I am confused, you said T2 and 2" in the same sentence. Anyway if it is the T2 prism, it also won't fit, it is smaller.  Baader has a 2inch nosepiece that threads to T2 with safety kerfs (need to buy separately).

[BlueMoon]

If it's of any interest, Agena Astro has a fairly comprehensive treatment of astronomy-related threads here: https://agenaastro.c...1PODByhigWfL0oU

[39.1N84.5W]

Thanks CloudGazer. I'll buy the baader nosepiece for the baader prism.

[SeattleScott]

It is hard to tell exactly what you are getting, but remember some of these Baader prisms have less clear aperture than a normal 2” diagonal. So you need to consider the field stop of the eyepiece you plan to use with it, and compare it to the clear aperture of the diagonal.